<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style type="text/css">
    .grid {
      margin: auto;
      width: 530px;
      text-align: center;
    }

    .grid table {
      border-top: 1px solid #C2D89A;
      width: 100%;
      border-collapse: collapse;
    }

    .grid th,
    td {
      padding: 10;
      border: 1px dashed #F3DCAB;
      height: 35px;
      line-height: 35px;
    }

    .grid th {
      background-color: #F3DCAB;
    }

    .grid .book {
      padding-bottom: 10px;
      padding-top: 5px;
      background-color: #F3DCAB;
    }

    .grid .total {
      height: 30px;
      line-height: 30px;
      background-color: #F3DCAB;
      border-top: 1px solid #C2D89A;
    }
  </style>
</head>

<body>
  <div id="app">
    <div class="grid">
      <div>
        <h1>图书管理</h1>
        <div class="book">
          <div>
            <label for="id">
              编号：
            </label>
            <input type="text" id="id" v-model='id' :disabled="flag" v-focus>
            <label for="name">
              名称：
            </label>
            <input type="text" id="name" v-model='name'>
            <button @click='handle' :disabled="submitFlag">提交</button>
          </div>
        </div>
      </div>
      <div class="total">
        <span>图书总数：</span>
        <span>{{books.length}}</span>
      </div>
      <table>
        <thead>
          <tr>
            <th>编号</th>
            <th>名称</th>
            <th>时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr :key='item.id' v-for='item in books'>
            <td>{{item.id}}</td>
            <td>{{item.name}}</td>
            <td>{{item.date | format('YYYY-MM-DD HH:mm:ss')}}</td>
            <td>
              <a href="" @click.prevent='toEdit(item.id)'>修改</a>
              <span>|</span>
              <a href="" @click.prevent='deleteBook(item.id)'>删除</a>
            </td>
          </tr>
        </tbody>
      </table>
    </div>
  </div>
  <script type="text/javascript" src="js/vue.js"></script>
  <script src="js/moment.js"></script>
  <script>
    Vue.directive('focus', function (e) {
      e.focus();
      console.log(111111);
    })
    var vm = new Vue({
      el: '#app',
      data: {
        books: [{
          id: 1,
          name: '三国演义',
          date: 2525609975000
        }, {
          id: 2,
          name: '水浒传',
          date: 2525609975000
        }, {
          id: 3,
          name: '红楼梦',
          date: 2525609975000
        }, {
          id: 4,
          name: '西游记',
          date: 2525609975000
        }],
        id: null,
        flag: false,
        name: '',
        submitFlag: false,
        totalBookNum: 0
      },
      methods: {
        handle(id) {
          this.submitFlag = true
          if (this.flag) {
            this.books.forEach((item, index) => {
              if (item.id == this.id) {
                item.name = this.name
                return
              }
            })
          } else {
            this.books.push({
              id: this.id,
              name: this.name,
              date: new Date().toUTCString()
            })
          }
          this.name = ''
          this.id = ''
          this.submitFlag = false
          this.flag = false
        },
        toEdit(id) {
          this.id = id;
          // 方法一
          let book = this.books.filter(item => {
            if (item.id === id)
              return true
          })[0]
          this.flag = true
          this.name = book.name

          // 方法二7
          // this.books.forEach(item => {
          //   if (item.id == id) {
          //     this.flag = true
          //     this.name = item.name
          //     return;
          //   }
          // });
        },
        deleteBook(id) {
          // 第一种
          this.books = this.books.filter(item => {
            return item.id != id;
          })

          // 第二种
          // this.books.forEach((item, i) => {
          //   if (item.id == id) {
          //     this.books.splice(i, 1);
          //     return;
          //   }
          // });
        }
      },
      filters: {
        format(val, str) {
          return moment(val).format(str);
        }
      },
      // watch: {
      //   id: function (val, oldVal) {
      //     this.books.some(item => {
      //       return val === item.id
      //     })
      //   }
      // },
    })
  </script>
</body>

</html>